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首页> 外文期刊>Journal of Heat Transfer >A Unit Cube-Based Model for Heat Transfer and Fluid Flow in Porous Carbon Foam
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A Unit Cube-Based Model for Heat Transfer and Fluid Flow in Porous Carbon Foam

机译：基于单元立方体的多孔碳泡沫传热和流体流动模型

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摘要

A unit-cube geometry model is proposed to characterize the internal structure of porous carbon foam. The unit-cube model is based on interconnected sphere-centered cubes, where the interconnected spheres represent the fluid or void phase. The unit-cube model is used to derive all of the geometric parameters required to calculate the heat transfer and flow through the porous foam. An expression for the effective thermal conductivity is derived based on the unit-cube geometry. Validations show that the conductivity model gives excellent predictions of the effective conductivity as a function of porosity. When combined with existing expressions for the pore-level Nusselt number, the proposed model also yields reasonable predictions of the internal convective heat transfer, but estimates could be improved if a Nusselt number expression for a spherical void phase material were available. Estimates of the fluid pressure drop are shown to be well-described using the Darcy-Forchhiemer law, however, further exploration is required to understand how the permeability and Forchhiemer coefficients vary as a function of porosity and pore diameter.
机译：提出了一个多维数据集几何模型来表征多孔碳泡沫的内部结构。单位立方体模型基于互连的以球为中心的立方体，其中互连的球代表流体或空隙相。单位立方模型用于导出计算热传递和通过多孔泡沫的流量所需的所有几何参数。有效导热率的表达式是基于单位立方几何体得出的。验证表明，电导率模型可以很好地预测有效电导率随孔隙率的变化。当与现有的孔隙水平努塞尔数表达式结合使用时，提出的模型还可以对内部对流换热做出合理的预测，但如果可以得到球形空隙相材料的努塞尔数表达式，则可以提高估计值。流体压降的估计值已显示出使用达西-福尔希默定律（Darcy-Forchhiemer law）的详尽描述，但是，需要进一步探索以了解渗透率和福尔赫默系数如何随孔隙率和孔径的变化而变化。

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